Muffler



Nov. 7, 1933. q HARTSOCK 1,934,463

MUFFLER Filed D80, 5, 1930 i INVENTOR.

TTO x Patented Nov. 7, 1933 momma Guy n. W, South Bend, Ina,

mesne assignments, to C. F. Burgess alcignor, by

Laboratories, Ina, Madison,,Wis., a corporation 0! Delaware Application December 5,1930. SerialNo. 500,155

8 Claims. -(Cl, 137-160) This invention relates to attachments for O81"! buretors.

It is an object of the invention to eliminate sound vibrations from the airpassing into a carburetor.

A further object resides in the filtering 01 imbeing ied to acarburetor to prevent the entrance into the carburetoroilparticles of dirt and the like which are suspended in the air.

Another object comprises the provision ofmeans disposed on the air intake pipe of a carburetor which functions both as a muilier to deaden sound vibrations and as an air filtering It is a still further object to provide air attachment tor carburetors having means for associating the device with the air-intake pipe of a the carburetor, and having acoustic or sound absorbing material disposed within the device to permit passage of the air to the air intake pipe but being positioned to cause the inrushing air to impinge against the acoustic material for the absorption 01" sound vibration. The acoustic material is also arranged to baillethe passage 01' incomingair so as to eflect a considerable area of contact of the air therewith whereby to effect a complete absorption of objectionable sound. 1

A specific object relates to a mufller to be dis- 1 posed over an air intake pipe and having portions provided with sound absorbing material over their inner sur iaceaand being spaced to define a passage through the muiiler for incoming air, said muiiler being provided with an air filtering element disposed within the air passage formed by thespacing of the sound absorbing portions. Other objects and features of the invention not expressed above will be disclosed in the detaileddescription of the invention. and in the accompanying claims.

Referring to the drawing which is to be taken as illustrative only, and which represents a preferred embodimentot the invention,- there is shown a vertical sectional view oi the novel- The novel muiiler. embodying the features of the invention comprises an annular split resilient collar adapted to'be sprung over the upper portion of the air intake pipe. Collar 15 is formed with a horizontal circular flange 16 having removably secured thereon, as by attaching screws or the like,.not shown, a horizontal circular-member 17 which has a central aperture registering with the carburetor airintake opening. Member 1'! is spaced from flange 16 by means of a spacing ring 18, for the reception of the lower ends of the legs of a bridge 19 between the flange 16 and the inner portion of the member 17, the lower ends of the legs abuttingthe inner surface of the ring 18.

Member 1'1 is formed with an upstanding integral peripheral flange 20 upon which is supported airusto-conioal shell 21. having attached thereto by means of split pins 22, on its inner surface, a layer 01' sound absorbing material 23 which extends downwardly about the inner surface of flange 20. Pins 22 are turned at their inner ends to hold the soundabsorbing material in position, and shell 21 is formed with a central opening to permit free passage of air, the inner edge of the shell beingt'umed at 24 to form a further securing means for the sound absorbing layer 23. I

The 'shell 21 isprovided at its outer periphcry with a lip 24adapted snugly to overlap the upper portion of flange 16 to hold the shell 81ecurely in place, and it is further provided with an indented circumferential right angular groove 25 which receives a vertically disposed rigid reticulated cylinder 26.- Upon the upper end of the screen is supported a irusto-conical 'shell or dome 27 formed at its outer-circumferential edge with a horizontal circular flange 28 adapted to rest on the screen and having a lip 29 Through the opening in the center of the shell 27 and sound absorbing material 30 is extended a vertically disposed bolt 32 having an enlarged head at its upper end and which through the bridge 19 at its lower end. The lower end of the bolt is threaded for the reception of a nut 1 33 which is adjusted on the bolt to clamp the various parts of the muffler in position. The

bolt 32 may be provided at its upper end with a slit 34 for the reception 0! a screw driver or the like.

Elements 15,- 1'7, 21 and are prelerably stamped or pressed sheet metal. The sound absorbing material 23 and 30 is preferably formed of a non-combustible material such as asbestos felt. Other sound-absorbing material, however, of a fibrous, spongy or porous nature may be used; for example, steel, copper, or brass wool are suitable. The screen 26 preferably comprises several plies or laminae, but any suitable rigid material capable of filtering the incoming air may be used in lieu thereof.

The various parts of the muflier assembly are securely held in position when the nut 33 is tightly screwed on to the bolt 32. The enlarged head of the bolt 32 clamps shell-27 down onto the rigid screen 26 which in turn forces shell 21' against flange 20. The plate 17 must be independently secured to the flange 16. It will be seen from the above that the preferred form of muflier comprises a lightweight construction free from rattles, squeaks and the like, and comparatively inexpensive to manufacture.

The operation of the device is as follows:

Air which is sucked into the carburetor intake 11 first passes through the filtering screen 26 whereby suspended dust, dirt and the like are removed, ingress of air being permitted through the screen about the whole periphery thereof. The rapidly moving stream of air is angularly baflled against the upper sound absorbing layer 30 by means of shell 21, and passes downwardly absorbing material may be disposed on the upper surface of the shell 21. This and like variations which do not depart from the concept of the invention are considered to'be within its scope.

I claim: 1. A mufller for use in connection with carburetors comprising a base member adapted to be secured to the air intake pipe of a carburetor and provided with a central opening therein, a

dome, means for rigidly securing the dome in spaced relationshipwwith the base member, a centrally apertured intermediate member positioned between the base member and the dome, peripheral means for spacing the dome circumferentially from the intermediate member to form an air passage, said means being composed of air permeable material throughout its periphery, the dome being provided with sound absorbing material on its inner surface, additional sound absorbing material being disposed on a surface of said intermediate member.

'2; A mufller for use in connection with'carburetors comprising a base member adapted to be secured to the air intake pipe of a carburetor, an intermediate centrally apertured member supported upon said base member and sloping upwardly from its outer periphery, a peripheral spacing member supported at its lower end' upon the centrally apertured member and supporting a dome member at its upper end, the dome member and the intermediate member being spaced to form an air passage, and means acting in one direction on the dome' member and in the opposite direction on the base member toclamp the members in rigid relationship.

3. The combination described in claim 2 in which, the spacing member is composed of air permeable material about its periphery.

4. The combination described in claim 2 in which the dome member is provided at its inner surface with sound absorbing material.

5. The combination described in claim 2 in which the dome member is provided at its inner surface with sound absorbing material, additional sound absorbing material being disposed on a surface of said centrally apertured member.

6. A mufiier for use in connection with carburetors comprising a base member adapted to be secured to the air intake pipe of a carburetor, an intermediate centrally apertured member sup ported upon said base member and sloping upwardly from its outer periphery, a peripheral spacing member supported at its lower end upon the centrally apertured member and Supp rting a dome member at its upper end, the dome member and the intermediate member being spaced to form an air passage, and means acting in one direction on the dome member and in the opposite direction on the. base member to clamp the members in rigid relationship, the spacing memher being composed of air permeable material, s'ound absorbing material being disposed on the inner surfaces of the dome member and of the.

intermediate member.

GUY M. HARISOCK.. 

